/*
 *  Copyright 1999-2019 Seata.io Group.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package io.seata.server.console.impl.redis;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import io.seata.common.util.CollectionUtils;
import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
import org.springframework.stereotype.Component;
import io.seata.common.util.BeanUtils;
import io.seata.server.console.param.GlobalLockParam;
import io.seata.console.result.PageResult;
import io.seata.server.console.vo.GlobalLockVO;
import io.seata.server.console.service.GlobalLockService;
import io.seata.server.storage.redis.JedisPooledFactory;
import redis.clients.jedis.Jedis;
import static io.seata.common.Constants.ROW_LOCK_KEY_SPLIT_CHAR;
import static io.seata.common.exception.FrameworkErrorCode.ParameterRequired;
import static io.seata.common.util.StringUtils.isNotBlank;
import static io.seata.console.result.PageResult.checkPage;
import static io.seata.core.constants.RedisKeyConstants.DEFAULT_REDIS_SEATA_GLOBAL_LOCK_PREFIX;
import static io.seata.core.constants.RedisKeyConstants.DEFAULT_REDIS_SEATA_ROW_LOCK_PREFIX;
import static io.seata.core.constants.RedisKeyConstants.SPLIT;

/**
 * Global Lock Redis Service Impl.
 *
 * @author zhongxiang.wang
 * @author doubleDimple
 */
@Component
@org.springframework.context.annotation.Configuration
@ConditionalOnExpression("#{'redis'.equals('${lockMode}')}")
public class GlobalLockRedisServiceImpl implements GlobalLockService {

	@Override
	public PageResult<GlobalLockVO> query(GlobalLockParam param) {

		int total = 0;
		List<GlobalLockVO> globalLockVos;
		checkPage(param);
		if (isNotBlank(param.getXid())) {
			globalLockVos = queryGlobalByXid(param.getXid());
			total = globalLockVos.size();
			return PageResult.success(globalLockVos, total, param.getPageNum(), param.getPageSize());
		}
		else if (isNotBlank(param.getTableName()) && isNotBlank(param.getPk()) && isNotBlank(param.getResourceId())) {
			// SEATA_ROW_LOCK_jdbc:mysql://116.62.62.26/seata-order^^^order^^^2188
			String tableName = param.getTableName();
			String pk = param.getPk();
			String resourceId = param.getResourceId();
			globalLockVos = queryGlobalLockByRowKey(buildRowKey(tableName, pk, resourceId));
			total = globalLockVos.size();
			return PageResult.success(globalLockVos, total, param.getPageNum(), param.getPageSize());
		}
		else {
			return PageResult.failure(ParameterRequired.getErrCode(),
					"only three parameters of tableName,pk,resourceId or Xid are supported");
		}
	}

	private List<GlobalLockVO> queryGlobalLockByRowKey(String buildRowKey) {
		return readGlobalLockByRowKey(buildRowKey);
	}

	private String buildRowKey(String tableName, String pk, String resourceId) {
		return DEFAULT_REDIS_SEATA_ROW_LOCK_PREFIX + resourceId + SPLIT + tableName + SPLIT + pk;
	}

	private List<GlobalLockVO> queryGlobalByXid(String xid) {
		return readGlobalLockByXid(DEFAULT_REDIS_SEATA_GLOBAL_LOCK_PREFIX + xid);
	}

	private List<GlobalLockVO> readGlobalLockByXid(String key) {
		List<GlobalLockVO> vos = new ArrayList<>();
		try (Jedis jedis = JedisPooledFactory.getJedisInstance()) {
			Map<String, String> mapGlobalKeys = jedis.hgetAll(key);
			if (CollectionUtils.isNotEmpty(mapGlobalKeys)) {
				List<String> rowLockKeys = new ArrayList<>();
				mapGlobalKeys.forEach((k, v) -> rowLockKeys.addAll(Arrays.asList(v.split(ROW_LOCK_KEY_SPLIT_CHAR))));
				for (String rowLoclKey : rowLockKeys) {
					Map<String, String> mapRowLockKey = jedis.hgetAll(rowLoclKey);
					GlobalLockVO vo = (GlobalLockVO) BeanUtils.mapToObject(mapRowLockKey, GlobalLockVO.class);
					if (vo != null) {
						vos.add(vo);
					}
				}
			}
		}

		return vos;
	}

	private List<GlobalLockVO> readGlobalLockByRowKey(String key) {
		List<GlobalLockVO> vos = new ArrayList<>();
		try (Jedis jedis = JedisPooledFactory.getJedisInstance()) {
			Map<String, String> map = jedis.hgetAll(key);
			GlobalLockVO vo = (GlobalLockVO) BeanUtils.mapToObject(map, GlobalLockVO.class);
			if (vo != null) {
				vos.add(vo);
			}
		}
		return vos;
	}

}
